* Adverb: When it modifies an adjective, verb, or another adverb, it's an adverb.
* Examples: "It's quite cold outside." (modifies the adjective "cold")
"I quite enjoy this book." (modifies the verb "enjoy")
"She sang quite beautifully." (modifies the adverb "beautifully")
* Determiner: When it means "completely" or "entirely", it acts as a determiner.
* Examples: "I've had quite enough of this."
"They've quite lost their minds."
So, the part of speech for "quite" depends on its context within a sentence.